The storm can generate auroras: waving, colorful lights that appear in the sky.

Joe Kunches, a space scientist for the National Oceanic and
Atmospheric Administration, said the auroras may be seen along the
U.S.-Canada border and in northern Europe on Saturday night. They are
common farther north, like the Northern Lights, but magnetic storms like
this one can make them appear in lower latitudes, he said.

"The auroras are probably going to be more bright and more equator-ward," Kunches said.

Robert Leamon, a heliophysics scientist at NASA headquarters, said
the most notable lights will appear on the night side of the Earth when
the storm arrives.

"It might last into Saturday so you see something in the U.S. or
Europe, but if you lived in Siberia, say, you'd probably get the best
showing," he said.

According to NOAA's scale for geomagnetic storms, the storm heading
for Earth - rated low, at a G1 or G2 on a scale of one to five - could
be mildly problematic for high-latitude power systems or high-frequency
radios.

Leamon said some personal Global Positioning System devices, such as
his running watch, might be a little slow or briefly lose connections.

Kunches explained that the burst of energy heading for Earth is
called a coronal mass ejection, which means that some of the outer layer
of the sun - called the corona - was blown off by Thursday's solar
flare.

"The corona got blown off. It's like the roof got blown off the house
because you were having a great party or something," he said.

The storm is expected to reach Earth around 9 a.m. ET on Saturday and continue to affect the planet's magnetic field through Sunday.

As odd as the event may seem, Kunches said this storm isn't out of the ordinary.

"This is the time the sun should be doing this," he said. "We're in
the middle of the cycle - not necessarily the peak - but we're close to
it."

The sun has an 11-year solar cycle, he said, and this cycle's activity should reach its maximum in 2013 or 2014.

Given that the storm doesn't pose a threat, Kunches is excited about its arrival.

"It's wonderful from a scientific point of view," he said. "Its got
some properties that are impossible for us to discern until it gets on
top of us."